Ladder rung



Aug. 5, 1924. 1,503,880

P. BROMAN v LADDER RUNG Filed July 2l 1921 2 Sheets-Shear l AFS it-fnrna Baoiviaii, or ciiiorieo, ILLINOIS.

LADDER RUNG. A

Application filed July 1.921. Serial No. 486,394.

To all whom t may concern: u

Be it known that I, PETER B RQMAN, a citizen of the United States, residing at Chicago, in the county of Cook andState ofv Illinois, have invented a new and useful Ladder Ruiig, of which the following is a specification.

This invention relates to ladder rungs and theV process for making the saine, and is fully described in the following specification and shown in the accompanying drawings p in which Figure 1 is a partial perspective of a ladder embodying the invention;

Fig. 2 is a partial elevation of a blank showing the first step in making the ladder rung;

Fig. 3 is a similar' view showing the blank after the second operation in the process of manufacture Y Fig. 4 is a bottom plan view of the rung after the third operation when it is ready A for insertion in the side rail; v

Fig. 5 is af similar view showing t-he rung inserted in a side rail; Y Y

Fig. 6 is an end view of therung as shown in Fig. 5;

Fig. l is a partial perspective showing a inodilied forni of ladder rung; I

Figs. Sand 9 are partial elevations shoning the blank from which the ladder rungV is made after the firstand second operations respectively;

Figs. 10 and 11 are partial elevations at right angles toeach other showing the completed rung ready for insertion in a side rail;

Fig. 12 is similar to Fig. 11, but showing the rung pressed into a side rail and Fig. 13 is an end view of the rung shown in Fig. `10.

In the preferred embodiment shown in Figs. 4, 5 and 6, the rung has a tread 14 which is semi-circular in cross-section, the edges preferably terminating in straight parallel depending flanges 15.

This rung is best described by `following the steps in the process of its manufacture. The blank A shown in Fig. 2 is punched at each end from a flat bar of the saine width, thereby forming a plurality of tines 16, preferably three in number, with ears 17 extending therebetween. The blank A is of t-he same thickness throughout including the ends of the tines 16 which are pointed. The blank A as shown in Fig. 3 is the saine but with the tines 16 beveled as at 16a. This is preferably done by striking all of them on the same face with a hammer of any suitable form while the blank rests upon an anvil. Y

The next step in the process consists of bending the ears 17 transversely inwardly until they stand at right angles to the tread, bending the Ventire blank about a longitudinal axis until the edges stand in substantially parallel planes and twisting the central tine 16 about a longitudinal axis until it stands parallel to the edges 15, all as shown in Fig. 4.

This rung may then be inserted in wooden side-rails or stiles 18 as shown in Figs. 1 and 5 until the ears 17 engage the side-rails. The ltines 16 are preferably of such a length that theyinay be passed through the siderails and clinched on the opposite side. As the side faces of all the tines are parallel with each other, they may be disposed in line with the grain of the wood so as to minimize the danger of splitting the same.

The twisting of the central tines provides a twist or thread 16b at the proximal end of each of them to thread or wedge into the adjacent stile 18 similar to a single screw thread to more securely attach the rung.

A modified forni of rung is shown in Figs. 7 and 10 to 13. This rung is also made from sheet metal, preferably from strips the width of the blanks B and B shown in Figs. 8 and 9 and from these the ini'shed rungs are formed.

The blank B is stamped from sheet metal with longitudinally extending tines 19 and 19@L which are preferably tapered at their ends as shown in Fig. 8. An ear 2O is found between two of these tines.

The next step in the process of manu facture consists of bending the ear 20 at right angles to the body of the blank and beveling the ends of the tines as 19h, preferably by striking them with a suitable hammer while the blank rests upon an anvil.

The blank is then bent about the longitudinal line 21 forming an angle section as shown is Fig. 13, forming a flat tread 22 and a depending flange 23.

The tine 19a is also twisted at right angles to the tread 22 so that the broad sides of all the tines lie in parallel planes and at right angles to the tread and the twist or thread is provided at 19h.

broadly as possible in view of the prior art.-

Vilhat I claim as new7 and desire to secure by Letters Patent is:

l. rA ladder rung having a tread, a longitudinal iiange at anangle to the tread, and

a'pluralityV of tines having beveled edges extending longitudinally from the end of the rung, the stile-penetrating edges of all tines being parallel, one of said tines extending from the horizontal part ofsaid tread and being twisted into parallelism with the other tines.

2. A ladder rung having a stile-penetratn ing tine provided with a twist adjacent its proximal end.

3. A ladder rung having a tread and a stile-penetrating tine extending from the tread and provided with a twist adjacent its proximal end so disposing the distal end portion of the tine that its side faces are substantially longitudinal with respect to an engaged stile.

la 'A ladder rung having a substantially arcuate tread, a stilepenetrating tine extending therefrom provided with a twist adjacent its proximal end, said twist disposing the distal end portionvof the tine so that its greatertransverse dimension is sub# stantially radial with respect to the center of the arc of the tread.

5. A ladder rung having a plurality of stile-penetrating tines disposed with their Side faces at the distal end portions in substantially parallel planes, and a stile-penetrating tine arranged on a line passing inf termediate the first mentioned tines and twisted so that its side faces at the distal Vtine disposed on a line passing between the first mentioned tines and spaced therefrom, andv inwardly extending ears intermediate adjacent tines, the rung being transversely deflected vwhereby the ears substantially close thel adjacent end ofthe rung.

7. A ladder rung having stile-penetrating tines, a tread disposed out of the general planes of said tines, and a stile-penetrating tine extending from the tread, the sidefaces of said tines being in substantially parallel planes. e Y.

8. A ladder rung having a stile-penetrat ing tine, a tread disposed out of the general plane of said tine7 a stile-penetrating'tine extending. from the treadhaving a twist adjacent its proximal end, the side faces of said tines being in substantially parallel planes, and aninwardly extending ear intermediate the tines. Y

9. A ladder rung having stile-penetrating tines extending from an end thereof,

a tread arched above a plane 'intersected byv the upper edges ofsaid tines, a stile-penetrating ktine extending from said tread andV twisted sothat its side faces are in4 substantial parallelism with the sidejfaces ofV the first mentioned tines, and ears at said end extending inwardly intermediate the last mentioned tine and yfirst mentionedV tines to substantially close the said end of the rung. Y j

\ D Pn'rnia encargan. 

